Hey Mike
Have you considered making a replacement for the MPU ROM card (see picture) that allows for the card to be socketed on so that it doesn't have to be desoldered to replace the rom socket on the card?
I have heard of double sided cards somewhere that allow header pins to be soldered in the allow the board to be plugged into a socket on the board.
These cards are quite difficult to get out and after doing it the first time you are reluctant to solder it back on.
